Présentations Colloques

Oral Presentation
4.01
Session 4.01: Innovative economic instruments and institutions for achieving sustained groundwater use. Integrated socio-economic and biophysical modeling for groundwater and conjunctive use management
Hyde Peter
Groundwater management under the Murray Ð Darling Basin Plan
The Murray-Darling Basin extends over 1 million km2 of south-eastern Australia. The Basin has large groundwater resources (estimated storage is approximately 10.13 million GL) in three main aquifer types- alluvial, porous rock and fractured rock. Although there is significant storage in these aquifers, only a small percentage is accessible and water quality is often poor. Annual recharge across the Basin averages approximately 24,300 GL. **Groundwater use (mainly for agricultural irrigation) occurs across the entire Murray-Darling Basin with an annual average extraction of approximately 1,400 GL, representing on average 11% of total water use. In drought years groundwater use represents up to 25% of total water use across the Basin. The Murray-Darling Basin accounts for 70% of Australia’s irrigated agricultural output.**Adopted in November 2012, the development of the Murray – Darling Basin Plan was driven by the need to reduce surface water extraction and increase surface water availability for the environment. The objectives of the Basin Plan are to give effect to relevant international agreements, establish a sustainable and long-term adaptive management framework for the Basin water resources, optimise social, economic and environmental outcomes and improve water security for all uses of Basin water resources.**The Basin Plan, sets a Basin wide total for groundwater use of 3,334 GL y. This total is managed through the application of limits to management areas within the Basin called sustainable diversion limits (SDLs). The SDLs represent the environmentally sustainable level of take for the area. The SDLs were determined using numeric modelling or a sustainable yield methodology.**For groundwater resources, the Basin Plan represents the first time a limit on groundwater use and consistent management arrangements are implemented. The Basin Plan will be implemented by June 2019 through state prepared Water Resource Plans (WRPs). The implementation of the Basin Plan will result in better environmental outcomes and sustainable communities based on irrigated agriculture.**
Australia